In CC classes, tire width points are assessed for both Front and Rear tires over 205mm in section width, so your estimates are short 40 points in both cases.

Since you last competed in a Porsche, the Zone has created a Car Classification website that allows you to open an account and create as many car configurations as you like. Based on your answers to the car modification questions, it will automatically calculate the total points and CC class for your car, as well as spit out a Tech Sheet with all of your car points information incorporated: